Maxima Function
bessel_i (v, z)
The modified Bessel function of the first kind of order v and argument z.
bessel_i computes the array besselarray such that
besselarray [i] = bessel_i [i + v - int(v)] (z) for i from zero to int(v).
bessel_i is defined as
inf ==== - v - 2 k v + 2 k \ 2 z > ------------------- / k! gamma(v + k + 1) ==== k = 0
the infinite series is not used for computations.